Gradient coil for magnetic resonance imaging

(19)

(11)

EP 1 411 367 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	01.12.2004 Bulletin 2004/49

(43)	Date of publication A2:
	21.04.2004 Bulletin 2004/17

(21)	Application number: 03256514.5

(22)	Date of filing: 15.10.2003

(51)	International Patent Classification (IPC)⁷: G01R 33/385

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
	Designated Extension States:
	AL LT LV MK

(30)

Priority:

16.10.2002 US 65417

(71)	Applicant: GE Medical Systems Global Technology Company LLC
	Waukesha, Wisconsin 53188-1696 (US)

(72)	Inventors:
	Mckinnon, Graeme Colin Hartland Wisconsin 53029 (US) Liu, Qin Waukesha Wisconsin 53186 (US)

(74)	Representative: Pedder, James Cuthbert
	London Patent Operation General Electric International, Inc. 15 John Adam Street London WC2N 6LU London WC2N 6LU (GB)

(54)	Gradient coil for magnetic resonance imaging

(57) A gradient coil assembly (180) for use with an MR imaging system comprising: a main gradient coil (182) disposed about an imaging axis to produce a gradient field; a corrector coil (184) disposed about an imaging axis and positioned with a return portion substantially overlapping a return portion of main gradient coil (182). The main gradient coil (182) and said corrector coil (184) cooperate to provide a first field of view, the main gradient coil (182) operates to provide a second field of view. A method of reducing power deposition in a gradient coil assembly (180) comprising: determining a first current density corresponding to a first field-of-view for an effective gradient coil; computing a second current density corresponding to a second field of view, by reducing current from the first current density without changing a sign of said the associated therewith; determining a geometry for a main gradient coil (182); and ascertaining a geometry for a corrector coil (184).

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